What device is frequently used to filter contaminants from the air in pneumatic systems?

In pneumatic systems, filtering contaminants from the air is crucial to ensure efficient operation and longevity of the equipment. The device commonly utilized for this purpose is a filter separator.

Filter separators are specifically designed to remove both particulates and moisture from compressed air. They function by passing the air through a filtering medium that captures solid particles, while also allowing water to condense and separate from the air stream. This is important because contaminants like dust, pollen, and moisture can damage pneumatic tools and components, leading to decreased efficiency, increased wear, and potential failure.

In contrast, the other devices listed serve different functions. Regulators control the pressure of the air in the system, pressure relief valves are designed to release excess pressure to prevent system damage, and flow meters measure the rate of airflow. None of these devices actively filter out contaminants from the pneumatic air supply. Thus, the filter separator stands out as the appropriate choice for safeguarding the system against airborne impurities.